MarineMax, Inc.
US ˙ NYSE ˙ US5679081084

SecurityHZO / MarineMax, Inc.
InstitutionSei Investments Co
Latest Disclosed Ownership78,073 shares
Latest Disclosed Value $ 1,891,706
Sei Investments Co ownership in HZO / MarineMax, Inc.

On February 13, 2026 - Sei Investments Co filed a 13F-HR form disclosing ownership of 78,073 shares of MarineMax, Inc. (US:HZO) valued at $1,891,709 USD as of December 31, 2025. The entity filed a previous 13F-HR on November 13, 2025 disclosing 79,804 shares of MarineMax, Inc.. This represents a change in shares of -2.17% during the quarter. The current value of the position is $2,706,791 USD.

Sei Investments Co has a history of taking positions in derivatives of the underlying security (HZO) in the form of stock options.

Institutional Ownership: 13F and NPORT Filings

The Security and Class in the table below are shown exactly as filed by the investor. We do our best to track continuity of investments through acquisitions, and this will be reflected in the table as changes in names. In addition to descriptive data, performance of the investment is shown over time. To calculate quarterly performance, we first calculate cost basis of the shares purchased during the quarter, then use that to calculate gross profit. Quarterly return is Gross Profit / Starting Portfolio value.

Note that cost basis is calculated and stored in thousands, so small quarterly changes in shares frequently result in a cost basis of zero.

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Institutional Put/Call Ratios
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In addition to reporting standard equity and debt issues, institutions with more than 100MM assets under management must also disclose their put and call option holdings. Since put options generally indicate negative sentiment, and call options indicate positive sentiment, we can get a sense of the overall institutional sentiment by plotting the ratio of puts to calls. The chart to the right plots the historical put/call ratio for this instrument.

Using Put/Call Ratio as an indicator of investor sentiment overcomes one of the key deficiencies of using total institutional ownership, which is that a significant amount of assets under management are invested passively to track indices. Passively-managed funds do not typically buy options, so the put/call ratio indicator more closely tracks the sentiment of actively-managed funds.

HZO / MarineMax, Inc. Historical Put/Call Ratio
Disclosed Equity Positions (from 13F/NPORT Filings)
File
Date
Effective
Date
Form Security Class ID Avg Price
Paid (Est)
Reported
Shares
ΔShares ΔShares
(%)
Reported
Value
(x1000)
ΔValue
(%)
Alloc
(%)
ΔAlloc ΔAlloc (%) Cost Basis
(x1000)
Unrealized
Gain/Loss
(x1000)
2026-02-13 2025-12-31 13F MARINEMAX COM 567908108 78,073 -1,731 -2.17 1,892 -6.43 0.0019
2025-11-13 2025-09-30 13F MARINEMAX COM 567908108 79,804 -6,269 -7.28 2,021 -6.56 0.0022
2025-08-14 2025-06-30 13F MARINEMAX COM 567908108 86,073 -280,142 -76.50 2,164 -72.53 0.0025
2025-05-14 2025-03-31 13F/A-1 MARINEMAX COM 567908108 366,215 26,924 7.94 7,874 -19.84 0.0101
2025-05-13 2025-03-31 13F MARINEMAX COM 567908108 339,291 0 9,822 0.0107
2025-02-11 2024-12-31 13F MARINEMAX COM 567908108 339,291 55,259 19.46 9,822 -1.95 0.0126
2024-11-12 2024-09-30 13F MARINEMAX COM 567908108 284,032 4,815 1.72 10,018 10.83 0.0130
2024-08-13 2024-06-30 13F MARINEMAX COM 567908108 279,217 -22,564 -7.48 9,038 -9.95 0.0128
2024-05-07 2024-03-31 13F MARINEMAX COM 567908108 301,781 4,825 1.62 10,037 -13.11 0.0147
2024-02-14 2023-12-31 13F MARINEMAX COM 567908108 296,956 -258 -0.09 11,552 18.42 0.0185
2023-11-14 2023-09-30 13F MARINEMAX COM 567908108 297,214 6,349 2.18 9,755 -1.82 0.0175
2023-08-11 2023-06-30 13F MARINEMAX COM 567908108 290,865 -4,000 -1.36 9,936 17.20 0.0173
2023-05-12 2023-03-31 13F MARINEMAX COM 567908108 294,865 15,937 5.71 8,477 -2.65 0.0157
2023-02-10 2022-12-31 13F MARINEMAX COM 567908108 278,928 -2,319 -0.82 8,708 3.94 0.0194
2022-11-14 2022-09-30 13F MARINEMAX COM 567908108 281,247 -34,392 -10.90 8,378 -26.52 0.0187
2022-08-15 2022-06-30 13F MARINEMAX COM 567908108 315,639 -11,246 -3.44 11,401 -13.37 0.0246
2022-05-13 2022-03-31 13F MARINEMAX COM 567908108 326,885 26,810 8.93 13,160 -25.72 0.0265
2022-02-14 2021-12-31 13F MARINEMAX COM 567908108 300,075 99,219 49.40 17,716 81.78 0.0332
2021-11-12 2021-09-30 13F MARINEMAX COM 567908108 200,856 21,158 11.77 9,746 11.28 0.0204
2021-08-06 2021-06-30 13F MARINEMAX COM 567908108 179,698 39,454 28.13 8,758 26.52 0.0194
2021-05-12 2021-03-31 13F MARINEMAX COM 567908108 140,244 15,335 12.28 6,922 58.18 0.0174
2021-02-08 2020-12-31 13F MARINEMAX COM 567908108 124,909 10,879 9.54 4,376 49.50 0.0113
2020-12-04 2020-09-30 13F/A-1 MARINEMAX COM 567908108 114,030 74,407 187.79 2,927 229.99 0.0085
2020-11-06 2020-09-30 13F MARINEMAX COM 567908108 114,030 74,407 2,927 7,047.5652
2020-08-17 2020-06-30 13F/A-1 MARINEMAX COM 567908108 39,623 4,961 14.31 887 145.71 0.0028
2020-08-11 2020-06-30 13F MARINEMAX COM 567908108 33,035 -1,627 551 1,494.6168
2020-05-14 2020-03-31 13F MARINEMAX COM 567908108 34,662 1,627 4.93 361 -34.48 0.0013
2020-02-06 2019-12-31 13F MARINEMAX COM 567908108 33,035 -501 -1.49 551 6.17 0.0016
2019-11-12 2019-09-30 13F MARINEMAX COM 567908108 33,536 2,381 7.64 519 1.37 0.0013
2019-08-14 2019-06-30 13F MARINEMAX COM 567908108 31,155 21,336 217.29 512 172.34 0.0017
2019-05-15 2019-03-31 13F MARINEMAX COM 567908108 9,819 -369 -3.62 188 -12.96 0.0006
2019-02-13 2018-12-31 13F MARINEMAX COM 567908108 10,188 0 0.00 216 0.00 0.0008
2018-11-08 2018-09-30 13F MARINEMAX COM 567908108 10,188 4,913 93.14 216 116.00 0.0008
2018-08-03 2018-06-30 13F MARINEMAX COM 567908108 5,275 -28,705 -84.48 100 -84.87 0.0003
2018-05-11 2018-03-31 13F MARINEMAX COM 567908108 33,980 -11,327 -25.00 661 -22.87 0.0025
2018-02-08 2017-12-31 13F MARINEMAX COM 567908108 45,307 -14,517 -24.27 857 -13.43 0.0030
2017-11-06 2017-09-30 13F MARINEMAX COM 567908108 59,824 19,208 47.29 990 24.69 0.0035
2017-07-31 2017-06-30 13F MARINEMAX COM 567908108 40,616 4,660 12.96 794 2.06 0.0032
2017-05-05 2017-03-31 13F MARINEMAX COM 567908108 35,956 4,188 13.18 778 26.50 0.0034
2017-02-02 2016-12-31 13F MARINEMAX COM 567908108 31,768 28,545 885.67 615 817.91 0.0030
2016-11-04 2016-09-30 13F MARINEMAX COM 567908108 3,223 -378 -10.50 67 9.84 0.0003
2016-08-11 2016-06-30 13F MARINEMAX COM 567908108 3,601 1,042 40.72 61 22.00 0.0004
2016-05-10 2016-03-31 13F/A-1 MARINEMAX COM 567908108 2,559 -576 -18.37 50 -13.79 0.0003
2016-02-03 2015-12-31 13F MARINEMAX COM 567908108 3,135 -7,639 -70.90 58 -62.09 0.0004
2015-11-02 2015-09-30 13F/A-1 MARINEMAX COM 567908108 10,774 4,927 84.27 153 11.68 0.0014
2015-10-30 2015-09-30 13F MARINEMAX COM 567908108 10,774 153
2015-08-07 2015-06-30 13F/A-1 MARINEMAX COM 567908108 5,847 3,070 110.55 137 85.14 0.0012
2015-08-04 2015-06-30 13F MARINEMAX COM 567908108 5,847 3,070 137 0.0012
2015-05-14 2015-03-31 13F/A-1 MARINEMAX COM 567908108 2,777 0 0.00 74 32.14 0.0006
2015-05-01 2015-03-31 13F MARCHEX PUT 567908108 2,777 2,777 74 0.0006
2015-02-10 2014-12-31 13F MARINEMAX COM 567908108 2,777 2,777 56 0.0005
Disclosed Put Options
File
Date
Effective
Date
Form Security Class ID Opt Avg Share Price Shares ΔShares
(%)
Value
(x1000)
ΔValue
(%)
Prior Allocation
(%)
Allocation
(%)
ΔAllocation
(%)
Cost Basis
(x1000)
Profit
(x1000)
Return
(%)
2015-05-01 2015-03-31 13F MARCHEX PUT 2,777 74 n/a n/a n/a
Legend
Shares
The total number of shares held by the institution at the end of the reporting period (the effective date). This is provided in the filing.
Value
The total value of the shares as of the effective date. This is provided in the filing.
Avg. Share Price
The weighted average share price of the shares held by the institution. We use FIFO accounting to determine this price
Class
This is the security class as indicated by the filer. There are a variety of values for this field. Common values include "EC" = equity common, "EP" - equity preferred
Allocation (%)
The percent of the institution's portfolio that this position represents. This is provided in NPORT filings. For 13F filings, we calculate it.
Change in Allocation
The change in allocation from the prior reporting period. This is calculated as current allocation - prior allocation.
Change in Allocation (%)
The percent change in allocation from the prior reporting period. This is calculated as (current allocation - prior allocation) / prior allocation.
Cost Basis
The total cost of the shares held. This is calculated as reported shares * avg. share price
Unrealized Gain/Loss
This is the market value of the position as of the effective date minus the cost basis.